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` h I <br /> 05 September 2003 <br /> AGE-NC Project No 97-0333 <br /> Page 6 of 10 <br /> 34 FINDINGS <br /> 11 <br /> Ground water elevation, flow direction and gradient were determined from field data collected on <br /> 27 March 2003, the contaminant Impact to ground water was quantified by laboratory analysis'of <br /> Iu� water samples collected on 27 and 28 March 2003 <br /> �] 3 4 1 Ground Water Elevation and Gradient <br /> The depths to ground water were measured at between 17 20 feet (MW-11A) and 19 55 feet <br /> (MW-7E) below the tops of the well casings on 27 March 2003, ground water elevations were <br /> calculated to be between 13 39 feet (MW-IIC) and 14 79 feet (MW-lOA) above mean sea level <br /> l� (MSL) Based on current and previous monitoring data collected from wells MW-1 through MW-13, <br /> l ground water elevation at the site generally Increased an average 2 48 feet between the November <br /> 2002 and the March 2003 ground water monitoring events <br /> Ground water elevation data collected from multi-level wells MW-11, MW-12 and MW-13 on 27 <br /> March 2003 is depicted on cross section F-F'(Figure 3) The vertical gradients between adjacent <br /> screen intervals are depicted on cross section F-F', the vertical gradient was calculated by <br /> determining the difference between ground water elevations (dh) and dividing by the difference of <br /> I the screen interval midpoints(dl) Generally,a pronounced downward vertical gradient was observed <br /> at the site between the First Zone and the upper Second Zone, generally, neutral vertical gradients <br /> were observed at all other locations <br /> I� The 27 March 2003 ground water elevation data collected from the Rainwater Car Wash site was <br /> plotted for the Informal First Zone, Second Zone, Third Zone and Primary Aquifer Zone <br /> I-1 hydrogeologic flow units, and are depicted in Figures 4 through 7 <br /> 1 I' <br /> 3 4 1 1 First Zone Aquifer <br /> Ground water elevation data collected in the First Zone Aquifer (15 to 47 feet bsg) inferred an <br /> inward-radiating ground water flow towards a ground water depression in the area of wells MW-2, <br /> MW-6,MW-7 and EW-1 (Figure 4), ground water gradients ranged from 0 01 ft/ft or less to greater <br /> than 0 33 ft/ft within the depression Off-site in the area of wells MW-11,MW-12 and MW-13,the <br /> ground water flow direction varied between northeast in the area west of the site to northwest <br /> immediately north of the site <br /> l� <br /> 7 <br /> I� Advanced GeoEnvironmental,Inc <br />